Flat frankfurter



FIG. 1 is a top plan view of a flat frankfurter, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left end elevational view thereof;

FIG. 6 is a right end elevational view thereof. 

The ornamental design for a flat frankfurter, substantially as shown. 